1 soalan ppt chemistry paper 2 2012

7/29/2019 1 Soalan Ppt Chemistry Paper 2 2012

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Section A

Bahagian A

[60 marks]

[60 markah]

Answer all questions in this section.

Jawab semua soalan dalam bahagian ini.

1. Graph 2 shows the temperature against time when solid P is heated.

Graf 2 menunjukkan graf suhu melawan masa bagi pemanasan pepejal P.

Graph 1

Graf 1

(a) Based on Graph 1 , answer the following questions:

Berdasarkan Graf 1, jawab soalan-soalan berikut :

(i) What is meant by melting point ?

Apakah yang dimaksudkan dengan takat lebur ?

...........................................................................................................................................

.............................................................................................................................................[1 mark

(ii) State the melting point of substance P .

1

83

28

136

200

t1

t2

t3

t4

t5

Time / sMasa /s

Temperature / oC

Suhu / oC



Nyatakan takat lebur bahan P.

......................................................................................................................................... [1 mark]

(iii) Give the physical state of P from time t1 to t2.

Nyatakan keadaan fizik P dari masa t1 hingga t2.

........................................................................................................................................ [ 1 mark]

(iv) Explain why the temperature remains constant from time t1 to t2.

Terangkan kenapa suhu tidak berubah dari masa t1 hingga t2.

.........................................................................................................................................

.........................................................................................................................................

........................................................................................................................................ [2 marks

(b) When solid iodine is heated, it changes to purple fume.

Apabila pepejal iodin dipanaskan , ia bertukar ke wasap ungu

(i) Name the process involved.

Namakan proses yang terlibat.

..........................................................................................................................................[1 marks]

(ii) Name one isotope of iodine and state its use.

Namakan satu isotop untuk iodin dan nyatakan kegunaannya.

............................................................................................................................................

...........................................................................................................................................[2 marks

2. Table 2 shows the molecular formulae and observations for three compounds when they react with

bromine water.

Jadual 2 menunjukkan formula molekul dan pemerhatian bagi tiga sebatian apabila bertindakbals

dengan air bromin.

Compound

Sebatian

Molecular

Formula

Formula Molekul

Observation

Pemerhatian

P C2H4

Brown colour is decolourised

Warna perang menjadi tidak berwarna

QC2H6

Brown colour remains

Warna perang tidak berubah

R C4H10

…………………………………………….

Table 2

2



Jadual 2

(a) Name the homologous series for these compounds.

Namakan siri homolog bagi sebatian-sebatian ini.

i)

P : ......................................................

Q : …………………………………..

[ 2 marks ]

ii) Write the general formula for the homologous series of compounds Q and R?

Apakah formula am bagi siri homolog sebatian Q dan R?

..................................................................................................................

[ 1 mark ]

iii) In Table 4, complete the observation when compound R reacts with bromine

water.

Dalam Jadual 4, lengkapkan pemerhatian yang berlaku apabila sebatian R

bertindakbalas dengan air bromin.

[ 1 mark ]

iv) Name another substance that can replace bromine water.

Namakan bahan lain yang boleh menggantikan air bromin.

..................................................................................................................

[ 1 mark]

v) Explain why compound P is chemically more reactive than compound Q.

Jelaskan mengapa sebatian P lebih reaktif secara kimia berbanding sebatian Q.

..................................................................................................................

..................................................................................................................

[ 1 mark ](b) One mole of compound P and Q undergo complete combustion to form gas X and water.

Satu mol sebatian P dan Q mengalami pembakaran lengkap untuk menghasilkan gas X

dan air.

i) Name gas X.

Namakan gas X.

…………………………………………………………………………..

[ 1 mark ]

ii) Write a balanced chemical equation when compound P or Q reacts with oxygen.

Tulis persamaan kimia yang seimbang apabila sebatian P atau Q bertindak

balas dengan oksigen.

3



…………………………………………………………………………..

[ 1 mark ]

iii) Explain why the compound P burns with more soot compared to compound Q.

Jelaskan mengapa sebatian P terbakar dengan penghasilan jelaga yang lebih

banyak daripada sebatian Q.

…………………………………………………………………………

…………………………………………………………………………

[2 marks ]

3. Diagram 3 shows the chemical symbols which represent four elements W, X, Y and Z.

Rajah 3 menunjukkan simbol yang mewakili empat unsur iaitu unsur W, X, Y dan Z.

Diagram 3

Rajah 3

(a) State the number of electrons and neutrons in atom Z. Nyatakan bilangan elektron dan neutron dalam atom Z.

Number of electrons: ……………. Number of neutrons: ………

Bilangan elektron : Bilangan neutron:

[2 marks]

[2 markah]

(b) (i ) Define nucleon number.

Takrifkan nombor nukleon.

………………....………………………………………………………………...

..………………………………………………………………………………….

[1 mark ]

[1 markah]

(ii) State the nucleon number of atom Z.

Nyatakan nombor nukleon bagi atom Z .

........…………………………………………………………...............................

[1 mark ]

[1 markah]

(c) (i) Write the electron arrangement of atom X.

Tuliskan susunan elektron bagi atom X.

4

12

W

6

7

X

3

14

Y

6

40

Z

18



Copper(II) oxide

Kuprum(II) oksida

Heat

Panaska

n

Anhydrous calcium chloride,CaCl

2

Kalsium klorida kontang, CaCl2

HydrogengasGas hidrogen

PorcelaindishMangkuk

porselin

…………………………………………………………………………………...

[1 mark ]

[1 markah]

(ii) Draw the electron arrangement of atom X to show the position of protons, neutrons

and electrons in the atom.

Lukis susunan elektron bagi atom X untuk menunjukkan kedudukan proton, neutron

dan elektron dalam atom.

[2 marks]

(d) (i) Which two elements are isotopes?

Dua unsur yang manakah merupakan isotop?

……………………………………………………………………...................[1 mark ]

(ii) Explain why isotopes of an element have the same chemical properties.

Terangkan mengapa isotop sesuatu unsur mempunyai sifat kimia yang sama.

…………….……………………………………..…………………………….[1 mark ]

(iii) Give one usage of the isotope mentioned in (d) (i). Beri satu kegunaan isotop yang dinyatakan dalam jawapan (d) (i).

…………………………………………………………………………………[1 mark ]

4. Diagram 4 shows the set -up apparatus of an experiment to determine the empirical formula of copper

(II) oxide.

Rajah 4 menunjukkan susunan radas eksperimen untuk menentukan formula empirik bagi kuprum (II)

oksida.

5



Diagram 4

Rajah 4

(a) What is the meaning of chemical formula?

Apakah maksud formula kimia?

...………….……………………………………………………………………… [1 mark ]

(b) (i) Name an acid and metal that can be used to prepare hydrogen gas in this experiment.

Namakan suatu asid dan logam yang boleh digunakan untuk menyediakan gas hidrogen

dalam eksperimen ini.

…………………………………………………………………………………... [1 mark ]

(ii) Write a balanced chemical equation for the reaction between the acid and the metal in

(b) (i).

Tuliskan persamaan kimia yang berimbang untuk tindak balas yang berlaku di antara

asid dan logam di (b) (i).

………….………………………………...…………………………………… [1 mark ]

(c) State one precaution that must be taken before the copper (II) oxide is heated.

Nyatakan satu langkah berjaga-jaga yang perlu diambil sebelum kupum(II) oksida

dipanaskan.

………….……...………………………………………………………………………[1 mark ]

(d) Table 5 shows the results of an experiment carried out by a student.

Jadual 5 menunjukkan keputusan eksperimen yang dilakukan oleh pelajar.

Mass of combustion tube + porcelain dish

Jisim tiub pembakaran + mangkuk porselin

30.24g

Mass of combustion tube + porcelain dish + copper (II) oxide

Jisim tiub pembakaran + mangkuk porselin + kuprum(II) oksida

32.26g

Mass of combustion tube + porcelain dish + copper

Jisim tiub pembakaran + mangkuk porselin + kuprum

31.86g

6



Table 5

Jadual 5

(i) Calculate the number of moles of copper in this reaction.

[Relative atomic mass : Cu = 64]

Kirakan bilangan mol kuprum dalam tindak balas ini.

[Jisim atom relatif :i Cu= 64]

[1 mark ]

[1 markah]

(ii) Calculate the number of moles of oxygen in this reaction.

[Relative atomic mass : O = 16] Kirakan bilangan mol kuprum dalam tindak balas ini.

[Jisim atom relative: O= 16]

[1 mark ]

[1 markah]

(iii) Determine the empirical formula of copper (II) oxide.

Tentukan formula empirik kuprum (II) oksida.

[2 marks]

[2 markah]

(e) Name another metal oxide which uses the same method to determine the empirical formula.

Namakan suatu oksida logam yang lain di mana formula empiriknya ditentukan dengan

7



kaedah yang sama.

……..……………………………………………………………………………………

[1 mark ]

[1 markah]

(f) M is a reactive metal. Suggest a method to determine the empirical formula of the oxide of M.

M merupakan suatu logam reaktif. Cadangkan satu kaedah untuk menentukan formula

empirik bagi oksida M.

...........................................................................................................................................

[1 mark ]

[1 markah]

5. Diagram 6 shows part of the Periodic Table of the Elements. D, E, G, L, M, and J do not represent the

actual symbol of the elements.

Rajah 6 menunjukkan sebahagian daripada Jadual Berkala Unsur. D, E, K, L, M dan J tidak mewakili

simbol sebenar unsur-unsur berkenaan.

Diagram 6

Rajah 6

Using the letters in the Periodic Table of the Elements in Diagram 6, answer the following questions.

Dengan menggunakan huruf-huruf yang terdapat dalam Jadual Berkala pada Rajah 6, jawab soalan-

soalan berikut .

(a) (i) State the position of element E in the Periodic Table. Nyatakan kedudukan unsur E dalam Jadual Berkala.

……………………………………………………………………………………….…[2 marks]

(ii) Choose the element which exhibit different oxidation numbers in its compounds. Pilih unsur

yang mempunyai pelbagai nombor pengoksidaan di dalam sebatiannya.

8

L

D M

G

J

E



…………………………………………………………...……………………………..[1 mark ]

(b) Element D combines with element L to form a compound.

Unsur D bergabung dengan unsur L untuk membentuk suatu sebatian.

(i) Write the chemical formula of this compound.

Tuliskan formula kimia bagi sebatian ini.

..............................…………………………………………………………………........[1 mark ]

(ii) State one physical property of this compound.

Nyatakan satu sifat fizik sebatian ini.

………………………………………………………………………....................... [1 mark ]

(c) D and E have the same chemical properties.

D dan E mempunyai sifat-sifat kimia yang sama.

(i) Which element is more reactive?

Unsur yang manakah yang lebih reaktif?

...........................................................................................................................................[1 mark ]

(ii) Explain your answer in (c) (i).

Terangkan jawapan anda dalam (c) (i).

…………………………………………………………………………………………..

…………………………………………………………………………………………..[2 marks]

(d) (i) Which element exists as diatomic molecules?

Unsur yang manakah membentuk molekul dwiatom?

………………………………………………………………………………………….. [1 mark ]

(ii) Name the chemical bond in these diatomic molecules. Namakan ikatan kimia dalam molekul dwiatom ini.

..........................………………………………………………………………….............[1 mark ]

6. Table 7 shows the elements P, Q, R, S and T and their proton numbers.

Jadual 7 menunjukkan unsur P, Q, R, S dan T dan nombor proton masing-masing.

9



Elements P Q R S T

Proton number 6 8 12 17 20

Table 1

a) State the position of element P in the Periodic Table

Nyatakan kedudukan unsur P dalam Jadual Berkala.

………………………………………………………………………………………………… [1 mark]

b) Which elements have the same chemical properties?

Unsur yang manakah yang mempunyai sifat kimia yang sama?

………………………………………………………………………………………………… [1 mark]

c) Q atom forms an ion by accepting two electrons

Atom Q membentuk ion dengan menerima dua electron.

i) Write the formula of ion Q.

Tuliskan formula bagi ion Q.

……………………………………………………………………………………………… [1 mark]

ii) Write the electron arrangement of ion Q

Tuliskan susunan electron bagi ion Q

……………………………………………………………………………………………. [1 mark]

d) i) Write the chemical formula of the compound formed when

atom R reacts with atom S

……………………………………………………………………………………

[1 mark]

ii) State one physical property of compound in c) i)

………………………………………………………………………………………

[1 mark]

e) Explain why the size of atom S is smaller compared to the size of atom R

………………………………………………………………………………………

………………………………………………………………………………………

10



………………………………………………………………………………………

[2 marks]

f) Atom P and atom hydrogen react to form a molecule

[Proton number of hydrogen is 1]

i) How many hydrogen atoms in one molecule of the compound formed?

……………………………………………………………………………………………

[1 mark]

ii) Draw the electron arrangement of the compound formed between atom P and atom hydrogen

[2 marks]

3 Diagram 3 shows the apparatus set up to determine the melting point of substance X. In this

experiment, solid X is heated until it changes to molten state.

Rajah 3 menunjukkan susunan radas untuk menentukan takat lebur bahan X. Dalam ekspermen ini,

pepejal X dipanaskan sehingga ia berubah kepada cecair.

11

Water

Air Substance X

Bahan X

Thermometer

Termometer

Boiling tube

Tabung didih

Heat

Dipanaskan



Diagram 3

Rajah 3

Based on diagram 3, answer the following questions.

Berdasarkan rajah 3, jawab soalan-soalan berikut.

(a) What is the name of the process when solid changes to molten state?

Apakah proses apabila pepejal berubah menjadi leburan?

………………………………………………….………………………………………………

[1 mark]

(b) Solid X has a melting point of 90 C. If a test tube of molten X at 150 C is allowed to cool at⁰ ⁰

room temperature,

Pepejal X mempunyai takat lebur 90 C. Sekiranya tabung uji yang mengandungi leburan X ⁰

pada suhu 150 C disejukkan pada suhu bilik,⁰

(i) Sketch a graph of temperature against time for the cooling of molten X.

Lakarkan graf suhu melawan masa untuk penyejukan leburan X.

12



[2 marks]

(ii) How to avoid supercooling process?

Bagaimana untuk mengelakkan proses penyejukan lampau?

………………………………………………………………………………………..

[1 mark]

(iii) Draw a labelled apparatus set-up for the cooling process of substance X.

Lukis susunan radas berlabel untuk proses penyejukan bagi bahan X.

[ 2 marks]

(c) Particles consist of atom, molecule or ions. Why is an atom neutral?

Zarah-zarah terdiri daripada atom, molekul atau ion. Mengapakah atom adalah neutral?

………………………………………………………………………………………………….

[1 mark]

(d) A bromine atom has 35 protons and 45 neutrons. Write the standard representation of

bromine atom.

Satu atom bromin mempunyai 35 proton dan 45 neutron. Tuliskan perwakilan piawai untuk

atom bromin.

13



………………………………………………………………………………………………….

[1 mark]

(e) (i) What are isotopes?

Apakah isotop?

…………………………………………………………………………………………..

[1 mark]

(ii) Phosphorus-31 and phosphorus-32 are isotopes of phosphorus. State one use of

phosphorus-32.

Fosforus-31 dan fosforus-32 adalah isotop untuk fosforus. Nyatakan satu kegunaan

fosforus-32.

……………………………………………………….………………………………….

[1 mark]

Section B

Bahagian B

[20 marks]

[20 markah]

Answer any one question from this section.

Jawab mana-mana satu soalan daripada bahagian ini.

7 Diagram 7 shows parts of the Periodic Table of elements.

Rajah 7 menunjukkan sebahagian unsur dalam Jadual Berkala.

1 2 13 14 15 16 17 18

C O

Mg Al Cl

Diagram 7 Rajah 7

(a) Write the electron arrangements for the ions formed from aluminium atom and

oxygen atom.

Tuliskan susunan elektron bagi ion yang terbentuk daripada atom aluminium dan

atom oksigen.

[2 marks]

14



(b) By drawing the electron arrangement of compounds formed, describe how

Dengan melukis susunan elektron bagi sebatian yang terbentuk, huraikan bagaimana

(i) Ionic bond formed between magnesium atom and chlorine atom.

Ikatan ionik terbentuk di antara atom magnesium dengan atom klorin.

[5 marks]

(ii) Covalent bond formed between carbon atom and chlorine atom.

Ikatan kovalen terbentuk di antara atom karbon dengan atom klorin.[5 marks]

(c) Explain why

Terangkan kenapa

(i) Compound formed in (b)(i) can conduct electricity in the molten state while

compound formed in (b)(ii) cannot conduct electricity in any states.

Sebatian yang terbentuk dalam (b)(i) boleh mengkonduksikan elektrik dalam

keadaan leburan manakala sebatian yang terbentuk dalam (b)(ii) tidak dapat

mengkonduksikan elektrik dalam semua keadaan.

[4 marks]

(ii) The melting and boiling points for compound in (b)(i) is higher than

compound in (b)(ii).

Takat lebur dan takat didih bagi sebatian dalam (b)(i) lebih tinggi daripada

sebatian dalam (b)(ii).

[4 marks]

8. (a) State the meaning of

(i) Relative atomic mass

(ii) One mol of a substance

(iii) Molar mass

(iv) Molar volume

(8 marks)

(b)

1 mole of any gas occupies 24 dm3 at room condition

Explain why 16 g of oxygen gas occupies the same volume as 22 g of carbon dioxide at

roomcondition. [Relative atomic mass : O=16 ; C=12 ]

(4 marks)

(c)

15



Caffeine is one of the substances in coffee. 0.97 g of caffeine consists of

0.48 g carbon, 0.05 g hydrogen, 0.28 g nitrogen and 0.16 g oxygen.

The molar mass of caffeine is 194 g mol-1.

Based on the information above, determine the empirical formula and molecular formula

of caffeine. [ Relative atomic mass : C=12 ; H=1 ; O=16 ; N=14]

(8 marks)

Section C

Bahagian C

[20 marks]

[20 markah]

Answer any one question from this section.

Jawab mana-mana satu soalan daripada bahagian ini.

9 (a)

(b)

By using suitable example, explain what are meant by empirical formula and molecular

formula. Dengan menggunakan contoh yang sesuai, terangkan apa yang dimaksudkan dengan

formula empirik dan formula molekul.

[3 marks]

The information below is for compound Q

Maklumat berikut adalah bagi sebatian Q.

• Carbon 40.00%Karbon

• Hydrogen 6.66% Hidrogen

• Oxygen 53.33% Oksigen

• Relative molecular mass 180Jisim molekul relatif

16



Based on the information of compound Q, determine:

Berdasarkan maklumat bagi sebatian Q, tentukan:

(i) The empirical formula

Formula empiriknya

(ii) The molecular formula

Formula molekulnya

[ Relative atomic mass: C,12; H,1; O,16]

[ Jisim atom relatif: C,12; H,1; O,16]

[ 5 marks]

(c) Diagram 9 shows the set-up of apparatus to determine the empirical formula of two

different compounds.

Rajah 9 menunjukkan susunan radas bagi menentukan formula empirik dua sebatian yang

berlainan.

Method I

Kaedah I

Method II

Kaedah II

Metal

Logam

dryhydrogen gas

Gas hidrogen

kering

Heat

Panaskan

Table 9

Rajah 9

(i) Explain why method II is not suitable to determine the empirical formula of

magnesium oxide?

17

Asbestos

paper

Kertas

Metal oxide / Oksida



Terangkan mengapa kaedah II tidak sesuai bagi menentukan formula empirik bagi

magnesium oksida?

[1mark]

(ii) Suggest one metal oxide in method II.

Cadangkan satu oksida logam dalam kaedah II.

[1 mark]

(iii) Using a suitable example, describe a laboratory experiment to determine the

empirical formula of an oxide of a reactive metal. Your explanation should include:

Dengan menggunakan contoh yang sesuai, huraikan suatu eksperimen di makmal

untuk menentukan formula empirik bagi suatu oksida logam reaktif.. Penerangan

anda mestilah meliputi :

• Procedure of the experiment

Prosedur bagi eksperimen

• Tabulation of data

Penjadualan data

[10 marks]

10. (a) Scientists such as Antoine Lavoisier, Johann W. Dobereiner, John Newlands, Lothar Meyer and Dmitri

Mendeleev have contributed greatly to the development of the Periodic Table of elements. Describe

briefly their contributions.

(10 marks)

(b) Explain the differences between the Periodic Table proposed by Antoine Lavoisier and the ModernPeriodic Table.

(6 marks)

(c) The valence electron of helium is 2. Is helium a Group 2 element ? Explain why.

(4 marks)

18



10. a) Sodium is one of the group 1 elements in the Periodic Table.

Diagram 9.1 shows the chemical properties of sodium .

Natrium merupakan salah satu unsure Kumpulan 1 dalam Jadual Berkala.

Rajah 9.1 menunjukkan sifat kimia bagi natrium.

Sodium

Natrium

Metal oxide

Oksida logam

Solution Q and gas W

Larutan Q dan gas W

i) Name Solution Q and gas W.

Namakan solution Q dan gas W (2 marks)

ii) Based on reaction R, write the chemical equation for the reaction.

State three physical properties of metal oxide formed.

Berdasarkan tindak balas R, tuliskan persamaan kimia bagi tindak balas tersebut.

Nyatakan tiga sifat fizikal oksida logam yang terbentuk. (4 marks)

b) Inert gases are referred to elements in group 18 in Periodic Table.

Gas Adi merujuk kepada unsure kumpulan 18 dalam Jadual Berkala Unsur.

i) Name all elements in Group 18.

Namakan semua unsure Kumpulan 18

ii) State four physical properties of Group 18 elements.

Nyatakan empat cirri-ciri fizikal unsure kumpulan 18. (5 marks)

c) Diagram 9.2 shows three atomic symbol of element X, Y and Z.

Diagram 9.2 menunjukkan symbol atom bagi unsure X, Y dan Z.

12X

6

27 Y

13

Construct a table to show the electron arrangement, group and period of each element.

Bina satu jadual untuk menunjukkan susuna electron, kumpulan dank ala bagi setiap unsur.

9 marks)19

40

Z

2

0



20

1 soalan ppt chemistry paper 2 2012

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